Agile Web Development with Rails 4 (Facets of Ruby) by Dave Thomas, David Heinemeier Hansson, Sam Ruby

By Dave Thomas, David Heinemeier Hansson, Sam Ruby

Rails simply retains on altering. either Rails three and four, in addition to Ruby 1.9 and 2.0, deliver hundreds of thousands of advancements, together with new APIs and gigantic functionality improvements. The fourth version of this award-winning vintage has been reorganized and refocused so it's extra necessary than ever earlier than for builders new to Ruby and Rails.

Rails four introduces a couple of user-facing adjustments, and the publication has been up to date to check the entire newest adjustments and new most sensible practices in Rails. This comprises complete help for Ruby 2.0, controller matters, Russian Doll caching, robust parameters, Turbolinks, new try out and bin listing layouts, and masses more.

Ruby on Rails is helping you produce top of the range, beautiful-looking internet purposes fast. you think about growing the applying, and Rails looks after the details.

Tens of millions of builders have used this award-winning e-book to benefit Rails. It's a extensive, far-reaching instructional and reference that's steered via the Rails middle workforce. If you're new to Rails, you'll get step by step assistance. If you're an skilled developer, this publication offers you the great, insider details you need.

Rails has developed through the years, and this ebook has advanced in addition to it. We nonetheless commence with a step by step walkthrough of establishing a true program, and in-depth chapters examine the integrated Rails good points. This variation now offers new Ruby and Rails clients additional info at the Ruby language and takes extra time to provide an explanation for key strategies all through. top practices on how one can practice Rails proceed to alter, and this variation retains up. Examples use issues, Russian Doll caching, and Turbolinks, and the e-book focuses all through at the correct approach to use Rails. also, this version now works on Ruby 2.0, a brand new unencumber of Ruby with large sensible and function improvements.

This version is for Rails4.0 and beyond.

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Example text

Again, this needn’t be the case, but we have no compelling reason to use a new controller right now. We already defined a goodbye action for this controller, so all that remains is to create a new template in the directory app/views/say. erb because by default templates are named after their associated actions.

It was nice having you here.

Fire up our trusty browser again, but this time point to our new view using the URL http://localhost:3000/say/goodbye. You should see something like this: Figure 3—Our second action Now we need to link the two screens.

Fortunately, these aren’t risks we have to take. Rails comes with a bunch of helper methods that can be used in view templates. Here, we’ll use the helper method link_to(), which creates a hyperlink to an action.

It is now <%= @time %>

Time to say <%= link_to "Goodbye", say_goodbye_path %>!

There’s a link_to() call within an ERB <%=…%> sequence. This creates a link to a URL that will invoke the goodbye() action. The first parameter in the call to link_to() is the text to be displayed in the hyperlink, and the next parameter tells Rails to generate the link to the goodbye() action.

It is only meant to explain enough Ruby that the examples in the book make sense. This chapter draws heavily from material in Programming Ruby [TFH13]. If you think you need more background on the Ruby language (and at the risk of being grossly self-serving), we’d like to suggest that the best way to learn Ruby and the best reference for Ruby’s classes, modules, and libraries is Programming Ruby [TFH13] (also known as the PickAxe book). Welcome to the Ruby community! 1 Ruby Is an Object-Oriented Language Everything you manipulate in Ruby is an object, and the results of those manipulations are themselves objects.

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